Winners of Nasa's Let It Snow photography contest

White Silence, by Gabor Dvornik, who says: "The photo was taken in Hungary, near a little village called Szodliget. It was one of those chilly mornings when the sky was clear and the wind was calm. You could hear the small branches break as a bird flew near. The surface of the lake was smooth and covered with thin ice. Everything was white and not a sound heard. Like if everything had been frozen. Time itself."Picture: Gabor Dvornik/NASA/Rex Features